Where are the instructions?
Y = (-1/6)x + 5
X + 6y = 30
I'll assume you are supposed to solve this system of linear equations. Let's use the substitution method, since the first equation already gives y in terms of x:
x + 6([-1/6]x + 5) = 30
Then x - x + 30 = 30
Since this is always true, your system of linear equations has infiniately many solutions.